Your application requirement is to get the value of a parameter associated with the context namespace. Your developer mentions that sys_context can be used. However, you want to use global variables. Which approach is better and why?
Suppose you are trying to perform RMAN backup. There are three data files: 1, 2 and 3. In file 1, Oracle reads the 10th block and finds that this block is fragmented and hence does not provide consistent information. What does RMAN do?